Locking device for the well-doors of dumb-waiters.



No. 892,819. VPATENTED JULY 7. 1908.

A. 13.. FISCHER. I

LOOKING DEVICE FOR THE WELL DOORS OP DUMB WAITER S; I

. APPLICATION FILED DBO.19.1907. fi 2 BHEETB-BHEET 1;

"I I I 1 I I I I I I l 111i! 1111 11/1/11 Ara/r j// ll/I l/ Tia- I W/TNESSES INVENTOR LOCKING DEVICE P PATBNTED JULY '7, 1908. A. E. FISCHER.

OR THE WELL RS OF DUMB WAITERS. PLICATION FILED .1s,19o7.

2 SHEETS-SHEET 2.

' rig WI TNE SSE 8 UNITED STATES PATENT OFFICE.

ADAM FISCHER, OF NEW YORK, N. Y., ASSIGNOR TO AMELIA FISCHER, OF NEW YORK, N. Y.

Specification of Letters Patent.

Patented July 7, 1908.

Application filed December 19, 1907. Serial No. 407,158.

To all whom it may concern:

Be it known that I, ADAM E. FIsoHER, a citizen of the United States, and a resident of the city of New York, borough of Brooklyn, in the county of Kings and State of New York, have invented a new and Improved Locking Device for the Well-Doors of Dumb-Waiters, of which the following is a full, clear, and exact description.

The invention relates to dumb waiter and similar hoist-ways, and its object is to provide a new and improved locking device for the well doors of a dumb waiter or similar hoist-way, and capable of being manipulated on any floor of the building for locking the closed well door of one floor while unlocking the closed well-door of another floor and vice versa, thus rendering it impossible for both doors to be open or partly open at the same time, thereby preventing draft in the well and consequently reducing the spread of flames by way of the dumb waiter well in case of a fire in the building in which the dumb waiter is located.

The invention consists of novel features and parts and combinations of the same, which will be more fully described hereinafter and then ointed out in the claims.

A practica embodiment of the invention is represented in the accompanying drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is afront elevation of the improvement as applied, both doors being in a closed position and the lower door being locked against opening while the upper door is unlocked to permit its being opened; Fig. 2 is a transverse section of the same, on the line 2-2 of Fig. 1, the upper door being shown in an open osition; Fig. 3 is an enlarged cross section 0 the'same, showing the upper door unlocked and the lower door locked against opening; Fig. 4 is an enlarged cross section 0 the improvement at the upper door and showing the latter locked against opening; Fig. 5 is a sectional plan view of the same on the line 5-5 of Fig. 4; Fig. 6 is a face view ofv the improvement as applied to a dumb waiter having double doors at each well opening; Fig. 7 is a sectional plan view on the line 77 of Fig. 6, of the joint between the doors of the upper double door; and Fig. 8 is a like View on the line 88 of Fig. 6, of the joint between the doors of the lower double door.

The dumb-waiter shaft or Well A is provided at the different floors B, B of the building with entrance openings C, 0 adapted to be opened and closed by doors D and D, each of which may be either a single door, as indicated in Fig. 1, or 'a double door, as illustrated in Fig. 6. The doors D and D are mounted to swing and the door D is for this purpose provided at its bottom with a pivot E engaging a bearing E, attached to the door frame D of the door D (see Fig. 3). The top of the door D is provided with a keeper F having a rectangular opening .F adapted to register with a corresponding opening G in a keeper G, attached to the top cross bar of the door frame D The openings F and G are adapted to be engaged by a rectangular block I'l, secured on the lower end of a rod II mounted to slide up and down in the wall of the well A, as p ainly indicated in Figs. 3 and 4. The uper end of the rod His provided with a block similar to the block II, and adapted to register with openings G and F formed in keepers G F respectively, of which the keeper G-3 is attached to the sill of the upper door frame D while the keeper F is secured to the bottom of the door D. The top of the door D is provided with a pivot E enga ing a keeper E in the top cross bar of the oor frame D (see Figs. 1 and 2). The lower end of the rod II is provided with a pivot H engaging the door D, and a similar pivot II, engaging the door D, is arranged on the upper end of the rod II, it being understood that the pivots E, II, II and E are in vertical alinement with each other, so as to permit the doors D and D to swing on the said pivots when opening and closing the doors, as hereinafter more fully explained.

The rod II is provided on the floors B and B with handles I and I engaging suitable guideways J and J attached to the wall of the well A, so that. the handles I and I extend into the rooms adjacent to the well door openings C and C. Now a person on either floor B, B can take hold of the correspond ing handle I or I and move the rod I'I up or down, with a view to shift the blocks II, II

in such a manner that when the block H is in engagement with the keepers F, G (see Fig. 3), then the block H is out of engagement with the keeper F on the door D, to allow of swinging the latter door open, while the door D is held locked against opening by the rectangular block H engaging the correspondingly shaped opening F in the keeper F. When the door D is closed and the rod H is moved upward, then the block H moves in engagement with the opening F in the kee er F to lock the door D against opening ee Fig. 4), and at the same time the block H is moved out of engagement with the keeper F, thus allowing the door D to be swung open. When a door is open the rod H cannot be shifted either up or down, as the block H or H stands transversely to the corresponding opening F or F in the keeper F or F and only when the doors are closed is it possible to shift the rod H up or down. The lower end of the block H- and the u per end of the block 7 H are slightly bevel ed, to permit ready entrance of the blocks into the openings F and F when shifting the rod.

From the foregoing it will be seen that the locking device securelylocks one door against opening while unlocking the other door and vice versa, and. at the same time the pivots H H of the locking device form parts of the ivots for the doors D and D to swing on.

rom the foregoing it will be seen also that both doors are prevented from being open or partly open, at the same time thus preventing draft in the well A, and thereby reducing the spread of flames by way of the dumb waiter well A in case of a fire in the building in which the dumb waiter is located.

When the well openings C, C are provided with double doors D, D and D D as shown in Figs. 6, 7 and 8, then a locking device as described is used for the doors D, D", and a similar locking device is employed for the doors D D the upper doors D, D having their joint arranged in a reverse direction to the joint of the lower doors D, D, as will be readily understood by comparison of Figs. 7 and 8. Now by this arrangement neither of the doors D or D can be opened when only one of the locking devices is in position for unlocking the upper door D or D and neither of the doors D or D can be opened when only one of the locking devices is in position for unlocking the door D or D. Thus both locking devices must be actuated to move the same in like positions for either unlocking either set of doors D*, D or D, D.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In combination, a dumb waiter well having openings, upper and lower doors for closing the said openings, and a locking device common to both doors and arranged to said upper and lower doors and adapted to be engaged by the said blocks, one of the blocks engaging its keeper at the time the other block is out of engagement with its keeper and vice versa. 7

3. A device of the class described comprising the upper and lower doors a rod mounted to slide up and down a block on each end of the rod, and keepers heldon the said upper and lower doors and adaptedto be engaged by the said blocks, the rod when raised moving the upper block into engagement with the keeper on the upper door and moving the lower block out of engagement with the keeper on the lower door, and the rod when slid downward moving the upper block out of engagement with the keeper on the upper door and moving the lower block into engagement with the keeper on the lower door. v

4. A device of the class described, comprising the upper and lower doors a rod mounted to s de up and down a block on each end of the rod, keepers held on the said upper and lower doors and adapted to be engaged by the said blocks, the rod when raised moving the upper'block into engagement with the keeper on the upper door and moving the lower block out of engagement with the kee er on the lower door, and the rod when slic downward'moving the upper block out of engagement with the keeper on the upper door and moving the lower block into engagement with the keeper on the lower door, and keepers on the door frames in register with the keepers on the doors, the block engaging the keeper on a door at the same time it engages the adjacent keeper on the corresponding door frame.

5. A device of the class described, comprising the u per and lower doors a rod mounted to slide up and down a block on each end of the rod, and keepers held on the said upper and lower doors and adapted to be engaged by the said blocks, one of the blocks engaging its keeper at the time the other block is out of engagement with its keeper and vice'versa, the terminals of the rod forming pivots for the doors to swing on.

6. A device of the class described, comprising the 11 per and'lower doors a rod mounted to slide up and down a block on each end of the rod, keepers held on the said upper and lower doors and adapted to be engaged by the said blocks, one of the blocks engaging its keeper at the time the other block is out of engagement with its kee er and Vice versa, and handles on the sai rod, one at each floor.

7. In combination, a dumb Waiter shaft 5 having upper and lower door openings, double swing doors for each door opening, and locking devices each common to a door for the u per and lower door openings, to lock the oors of one door opening and un- 10 lock the doors of the other door opening, the I interlocking joints of the double doors for the upper and lower door openings extending in op osite directions.

In testimony whereof I have signed my name to this specification in the presence 15. of two subscribing witnesses.

ADAM E. FISCHER.

Witnesses:

THEo. G. HosTER, EVERARD B. MARsHALL. 

